<template>
  <div :class="`box-content min-h-30px w-full flex flex-row flex-wrap`" ref="containerRef">

     <!-- 分类横向滚动 -->
     <div class="category-tabs">
      <div
        v-for="cat in displayedCategoryList"
        :key="cat.id!"
        :class="['category-tab', { active: cat.id === categoryId }]"

        :style="cat.id === categoryId
          ? {
              color: property.categoryBtn.actColor,
              fontWeight: property.categoryBtn.weight ? 'bold' : 'normal',
              fontSize: property.categoryBtn.fontSize + 'rpx',
              background: property.categoryBtn.bgBeginColor,
              borderBottom: property.categoryBtn.underlineColor ? `2px solid ${property.categoryBtn.underlineColor}` : '2px solid transparent'
            }
          : {
              color: property.categoryBtn.color,
              borderBottom: '2px solid transparent',
              background: property.categoryBtn.bgColor,
              fontSize: property.categoryBtn.fontSize + 'rpx',
              fontWeight: 'normal'
            }"
        @click="onCategoryChange(cat.id!)"
      >
        {{ cat.name }}
      </div>
    </div>
    <div
      class="relative box-content flex flex-row flex-wrap overflow-hidden bg-white"
      :style="{
        ...calculateSpace(index),
        ...calculateWidth(),
        borderTopLeftRadius: `${property.borderRadiusTop}px`,
        borderTopRightRadius: `${property.borderRadiusTop}px`,
        borderBottomLeftRadius: `${property.borderRadiusBottom}px`,
        borderBottomRightRadius: `${property.borderRadiusBottom}px`
      }"
      v-for="(spu, index) in spuList"
      :key="index"
    >
      <!-- 角标 -->
      <div v-if="property.badge.show" class="absolute left-0 top-0 z-1 items-center justify-center">
        <el-image fit="cover" :src="property.badge.imgUrl" class="h-26px w-38px" />
      </div>
      <!-- 商品封面图 -->
      <div
        :class="[
          'h-140px',
          {
            'w-full': property.layoutType !== 'oneColSmallImg',
            'w-140px': property.layoutType === 'oneColSmallImg'
          }
        ]"
      >
        <el-image fit="cover" class="h-full w-full" :src="spu.picUrl" />
      </div>
      <div
        :class="[
          ' flex flex-col gap-8px p-8px box-border',
          {
            'w-full': property.layoutType !== 'oneColSmallImg',
            'w-[calc(100%-140px-16px)]': property.layoutType === 'oneColSmallImg'
          }
        ]"
      >
        <!-- 商品名称 -->
        <div
          v-if="property.fields.name.show"
          :class="[
            'text-14px ',
            {
              truncate: property.layoutType !== 'oneColSmallImg',
              'overflow-ellipsis line-clamp-2': property.layoutType === 'oneColSmallImg'
            }
          ]"
          :style="{ color: property.fields.name.color }"
        >
          {{ spu.name }}
        </div>
        <!-- 商品简介 -->
        <div
          v-if="property.fields.introduction.show"
          class="truncate text-12px"
          :style="{ color: property.fields.introduction.color }"
        >
          {{ spu.introduction }}
        </div>
        <div>
          <!-- 价格 -->
          <span
            v-if="property.fields.price.show"
            class="text-16px"
            :style="{ color: property.fields.price.color }"
          >
            ￥{{ fenToYuan(spu.price as any) }}
          </span>
          <!-- 市场价 -->
          <span
            v-if="property.fields.marketPrice.show && spu.marketPrice"
            class="ml-4px text-10px line-through"
            :style="{ color: property.fields.marketPrice.color }"
            >￥{{ fenToYuan(spu.marketPrice) }}
          </span>
        </div>
        <div class="text-12px">
          <!-- 销量 -->
          <span
            v-if="property.fields.salesCount.show"
            :style="{ color: property.fields.salesCount.color }"
          >
            已售{{ (spu.salesCount || 0) + (spu.virtualSalesCount || 0) }}件
          </span>
          <!-- 库存 -->
          <span v-if="property.fields.stock.show" :style="{ color: property.fields.stock.color }">
            库存{{ spu.stock || 0 }}
          </span>
        </div>
      </div>
       <!-- 立即购买按钮 -->
       <div v-if="property.btnShow && property.btnType.type === 'buy'" class="absolute bottom-8px right-8px">
          <!-- 文字按钮 -->
          <span
            v-if="property.btnBuy.type === 'text'"
            class="rounded-full p-x-12px p-y-4px text-12px text-white"
            :style="{
              background: `linear-gradient(to right, ${property.btnBuy.bgBeginColor}, ${property.btnBuy.bgEndColor}`
            }"
          >
            {{ property.btnBuy.text }}
          </span>
          <!-- 图片按钮 -->
          <el-image
            v-else
            class="h-28px w-28px rounded-full"
            fit="cover"
            :src="property.btnBuy.imgUrl"
          />
        </div>

        <!-- 加入购物车按钮 -->
        <div v-if="property.btnShow && property.btnType.type === 'cart'" class="absolute bottom-8px right-8px">
          <!-- 文字按钮 -->
          <span
            v-if="property.btnCart.type === 'text'"
            class="rounded-full p-x-12px p-y-4px text-12px text-white"
            :style="{
              background: `linear-gradient(to right, ${property.btnCart.bgBeginColor}, ${property.btnBuy.bgEndColor}`
            }"
          >
            {{ property.btnCart.text }}
          </span>
          <!-- 图片按钮 -->
          <el-image
            v-else
            class="h-28px w-28px rounded-full"
            fit="cover"
            :src="property.btnCart.imgUrl"
          />
        </div>
    </div>
  </div>
</template>
<script setup lang="ts">
import { CategoryProductCardProperty } from './config'
import * as ProductCategoryApi from '@/api/mall/product/category'
import * as ProductSpuApi from '@/api/mall/product/spu'
import { fenToYuan } from '../../../../../utils'
import { ref, onMounted, computed, watch } from 'vue'

/** 商品卡片 */
defineOptions({ name: 'NosideCategoryProductCardComponent' })
// 定义属性
const props = defineProps<{ property: CategoryProductCardProperty }>()
// 商品列表
const spuList = ref<ProductSpuApi.Spu[]>([])

interface DisplayCategory {
  id: number;
  name: string;
}

/**
 * 计算商品的间距
 * @param index 商品索引
 */
const calculateSpace = (index: number) => {
  // 商品的列数
  const columns = props.property.layoutType === 'twoCol' ? 2 : 1
  // 第一列没有左边距
  const marginLeft = index % columns === 0 ? '0' : props.property.space + 'px'
  // 第一行没有上边距
  const marginTop = index < columns ? '0' : props.property.space + 'px'

  return { marginLeft, marginTop }
}

// 容器
const containerRef = ref()
// 计算商品的宽度
const calculateWidth = () => {
  let width = '100%'
  // 双列时每列的宽度为：（总宽度 - 间距）/ 2
  if (props.property.layoutType === 'twoCol') {
    width = `${(containerRef.value.offsetWidth - props.property.space) / 2}px`
  }
  return { width }
}


const categoryList = ref<DisplayCategory[]>([])
const categoryId = ref(0)

const displayedCategoryList = computed(() => {
  const allCategory: DisplayCategory = { id: 0, name: '全部' }
  if (props.property.showAllCategory) {
    if (props.property.categoryIds && props.property.categoryIds.length > 0) {
      const filteredCategories = categoryList.value.filter(cat => props.property.categoryIds.includes(cat.id));
      return [allCategory, ...filteredCategories]
    } else {
      return [allCategory, ...categoryList.value]
    }
  } else {
    if (props.property.categoryIds && props.property.categoryIds.length > 0) {
      return categoryList.value.filter(cat => props.property.categoryIds.includes(cat.id));
    } else {
      return categoryList.value;
    }
  }
})


const fetchCategoryList = async () => {
  if (props.property.categoryIds && props.property.categoryIds.length > 0) {
    // 根据选中的分类 ID 列表获取分类详情
    const categories = await Promise.all(
      props.property.categoryIds.map(id => ProductCategoryApi.getCategory(id))
    );
    categoryList.value = categories.filter(
      (cat): cat is ProductCategoryApi.CategoryVO => cat != null && typeof cat.id === 'number'
    ).map(cat => ({ id: cat.id!, name: cat.name || '' }));

    if (categoryList.value && categoryList.value.length > 0) {
      categoryId.value = categoryList.value[0].id;
    } 
    
  }
}

const fetchSpuList = async () => {
   const params: { pageNo: number; pageSize: number; categoryId?: number } = {
     pageNo: 1,
     pageSize: 10,
   };
   if (categoryId.value !== 0) {
     params.categoryId = categoryId.value;
     let res = await ProductSpuApi.getSpuPage(params);
     spuList.value = res.list;

   }
 
}
const onCategoryChange = (id: number) => {
  categoryId.value = id
  fetchSpuList()
}

onMounted(async () => {
  await fetchCategoryList()
  await fetchSpuList()
})

watch(() => props.property.categoryIds, async () => {
  await fetchCategoryList();
  // 重置选中的分类 ID，如果当前选中的分类不在新的分类列表中，则默认选中"全部"
  if (!props.property.categoryIds.includes(categoryId.value)) {
    categoryId.value = 0;
  }
  await fetchSpuList();
}, { deep: true });

</script>

<style scoped lang="scss">
.category-tabs {
  display: flex;
  min-width: 100%;
  margin-bottom: 12px;
  overflow-x: auto;
  white-space: nowrap;
  background-color: black;
}

.category-tab {
  min-width: 143px;
  padding: 8px 16px;
  margin-right: 8px;
  text-align: center;
  cursor: pointer;
  user-select: none;
  flex-shrink: 0;
}

</style>
